AbstractVideoItemProvider.java

/*
 * Copyright 2014 Google Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.example.leanback.data;

import java.util.List;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.net.Uri;

public abstract class AbstractVideoItemProvider extends ContentProvider {
        private SQLiteOpenHelper mOpenHelper;

        interface Tables {
		String VIDEO_ITEM = "video_item";
        }

        interface Views {

        }

	private static final int VIDEOITEM = 0;
	private static final int VIDEOITEM__ID = 1;

        private static final UriMatcher sUriMatcher = buildUriMatcher();

        private static UriMatcher buildUriMatcher() {
                final UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
                final String authority = VideoItemContract.CONTENT_AUTHORITY;

		matcher.addURI(authority, "videoitem", VIDEOITEM);
		matcher.addURI(authority, "videoitem/#", VIDEOITEM__ID);

                return matcher;
        }
    
        @Override
        public boolean onCreate() {
           mOpenHelper = new VideoDatabase(getContext());
           return true;
        }

        @Override
        public String getType(Uri uri) {
                final int match = sUriMatcher.match(uri);
                switch (match) {
			case VIDEOITEM:
				return VideoItemContract.VideoItem.CONTENT_TYPE;
			case VIDEOITEM__ID:
				return VideoItemContract.VideoItem.CONTENT_ITEM_TYPE;
                        default:
                                throw new UnsupportedOperationException("Unknown uri: " + uri);
                }
        }

        @Override
        public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
                final SQLiteDatabase db = mOpenHelper.getReadableDatabase();
                final SelectionBuilder builder = buildQuerySelection(uri);
                return builder.where(selection, selectionArgs).query(db, projection, sortOrder);
        }

        @Override
        public Uri insert(Uri uri, ContentValues values) {
                final SQLiteDatabase db = mOpenHelper.getWritableDatabase();
                final int match = sUriMatcher.match(uri);
                switch (match) {
                        case VIDEOITEM: {
                                final long _id = db.insertOrThrow(Tables.VIDEO_ITEM, null, values);
                                return VideoItemContract.VideoItem.buildItemUri(_id);
                        }
                        default: {
                                throw new UnsupportedOperationException("Unknown uri: " + uri);
                        }
                }
        }

        @Override
        public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
                final SQLiteDatabase db = mOpenHelper.getWritableDatabase();
                final SelectionBuilder builder = buildSelection(uri);
                return builder.where(selection, selectionArgs).update(db, values);
        }

        @Override
        public int delete(Uri uri, String selection, String[] selectionArgs) {
                final SQLiteDatabase db = mOpenHelper.getWritableDatabase();
                final SelectionBuilder builder = buildSelection(uri);
                return builder.where(selection, selectionArgs).delete(db);
        }

        private SelectionBuilder buildQuerySelection(Uri uri) {
                final SelectionBuilder builder = new SelectionBuilder();
                final List<String> paths = uri.getPathSegments();
                final int match = sUriMatcher.match(uri);
                switch (match) {

                        default: {
                                return buildSelection(uri, match, builder);
                        }
                }
        }

        private SelectionBuilder buildSelection(Uri uri) {
                final SelectionBuilder builder = new SelectionBuilder();
                final int match = sUriMatcher.match(uri);
                return buildSelection(uri, match, builder);
        }

        private SelectionBuilder buildSelection(Uri uri, int match, SelectionBuilder builder) {
                final List<String> paths = uri.getPathSegments();
                switch (match) {
                        case VIDEOITEM: {
                                return builder.table(Tables.VIDEO_ITEM);
                        }
                        case VIDEOITEM__ID: {
				final String _id = paths.get(1);
                                return builder.table(Tables.VIDEO_ITEM).where(VideoItemContract.VideoItem._ID + "=?", _id);
                        }
                        default: {
                                throw new UnsupportedOperationException("Unknown uri: " + uri);
                        }
                }
        }
}